Well some of the users facing the battery drain issue. there are some ways to mitigate it. 1st dont often charge your phone, usually when it goes below 40% you should rather char it it will improve battery life.
2. weekly once, charge it when it goes below 20 percent, its called overhaul charging, and it will also improve battery life.
3. Charge a bit extra when it reaches 100% like 10-15 mins more. Good for the batt.
4. Go to settings, then apps, and see the running process, other than the system processes, ou can shut the other process that drains your batt. It will keep your charge for long longer significantly.
From my using experience, I have a stand-by charge of 23days-20hours, and the estimated varies depening on usage. Follow these steps it will help battery life and drainage problem quite a bit

Very true. My Z1 are a big dessapointed after update 4.4.2 and after 4.4.4 kitkat. Restart everyday 4,5 times, hot temperature for not ussing,etc. More lag and bug. I will sell soon very cheep. Maybe 150$ its the corect price. I'm go out from this brand. Bye, bye Sony.

In my opinion , the battery is good ,but the sound of the device is low, but with headphones its awesome ! The cam in good ,but not enough , the device never lags and it runs apps and games awesomely , after the 4,4,4 update ,the cam started to hang ! But still can be fixed , and the phone it self feels premium and lovely , and after all , i think it worth buying :)

AnonD-288092, 28 Jul 2014It works fine but with the new software update (kitkat 4.4.4) my camera is having some trouble... moreMy Z1 Compact was freezing also and i did a reset and it seems to have fixed it.

I hadthis Prob with my z1, now crazy as it may seem because the headphone jack is unprotected you can get fluff in it. I had intermediate cutting outn for ages. Shine a VERY bright torch into the jack and you might come up trumps.

jmbs, 28 Jul 2014Hello . Some other said that the camera is like a 13mp cam. Is it true ?? Or.you just set it t... moreOn auto mode is 8 mpx. Auto = superior. If you want 20 mpx then switch to manual.
Photos are good. 80-90% of them. There background defocus, timeshift, so. It is ok. Photo is one of the best 10 in the android world.